<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  
</head>
<body>
  <div id="app">
  
    <input type="text" v-model="msg">
    
    {{ reverseMsg }}
    {{ reverseMsg }}
    {{ reverseMsg }}
    <hr>
    {{ reverseMsg2() }}
    {{ reverseMsg2() }}
    {{ reverseMsg2() }}
  </div>
  <script src="./vue.js"></script>
  <script>
    const vm = new Vue({
      el: '#app',
      data: {
        msg: 'hello world'
      },
      methods:{
        reverseMsg2(){
          console.log('method执行');
          return this.msg.split('').reverse().join('');
        }
      },
      computed: {
        reverseMsg(){
          console.log('计算属性执行了');
          return this.msg.split('').reverse().join('')
        }
      }
    })
    
  </script>
</body>
</html>